Exam Practice Questions And Correct

Process Plant Technician Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a P&ID in a process plant?
• To show construction drawings
• To illustrate site layout
• To depict process flow, instrumentation, and control elements
• To list equipment specifications

Rationale: P&IDs communicate how a process works, including equipment,

piping, and instrumentation.

• Which instrument is used to measure fluid pressure?
• Thermocouple
• Pressure gauge
• Flow rotameter 1 / 3

• pH analyzer

Rationale: Pressure gauges are specifically designed to measure fluid

pressure.

• What does LOTO stand for in plant safety?
• Lock-On Tag-Out
• Lockout/Tagout
• Lock Open/Tag Operate
• Local/Transfer Operation

Rationale: LOTO is the standard procedure to isolate hazardous energy

sources.

• Which valve type provides the most accurate flow control?
• Gate valve
• Ball valve
• Globe valve
• Plug valve

Rationale: Globe valves allow fine throttling and precise flow control.

5. A process pump cavitates when:

• Suction pressure is too high
• Suction pressure is too low
• Discharge valve is fully open
• Fluid temperature is too low 2 / 3

Rationale: Low suction pressure causes vapor bubbles that lead to

cavitation.

• What is the function of a heat exchanger?
• Store heat
• Measure temperature
• Transfer heat between fluids
• Increase pump efficiency

Rationale: Heat exchangers move heat from one medium to another.

• What is the most common cause of compressor surge?
• Low discharge pressure
• High suction flow
• Low suction flow
• Excessive lubrication

Rationale: Surge occurs when flow drops below a stable operating point.

8. A safety relief valve protects equipment from:

• Corrosion
• Overpressure
• Vibration
• Thermal expansion

Rationale: Relief valves release excess pressure to prevent equipment

damage.

• The lower explosive limit (LEL) represents:
• / 3